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Homework Help: Kenetic Theory of Gas

  1. May 5, 2009 #1
    1. The problem statement, all variables and given/known data
    The mass of a single HE atom is 6.65e-27kg. You have 5.00e-6 mole of HE gas which is occupying a volume of 1.00e-4m^3. when at pressure of 100Pa. Determine the temp of gas AND the average speed of the gas molecules.

    **I've found the temp of gas i need help on the avg speed - i believe i'm close
    2. Relevant equations

    3. The attempt at a solution
    Vrms=[tex]\sqrt{3(8.31J/mol K)(241)/(6.65e-27kg????)}[/tex]

    i'm not certain if i use 6.65e-27kg as molar mass?
  2. jcsd
  3. May 5, 2009 #2
    Note it gives you the mass of a single atom

    This is the amount of moles present

    After reading the above do you still think this?
  4. May 5, 2009 #3
    ahh i do apologise i had not realised you have calculated the temperature, please ignore the post above
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